ABB Relion 670 Series Applications Manual page 290

Section 12
Control
• CBREADY, circuit breaker ready for a reclosing cycle, for example, charged operating gear.
• CBCLOSED to ensure that the circuit breaker was closed when the line fault occurred and start was
applied.
• No signal at INHIBIT input that is, no blocking or inhibit signal present. After the start has been
accepted, it is latched in and an internal signal "start" is set. It can be interrupted by certain events,
like an "inhibit" signal.
12.2.2.3 Initiate auto reclosing from circuit breaker open information
If a user wants to initiate auto reclosing from the circuit breaker open position instead of from protection
trip signals, the function offers such a possibility. This starting mode is selected with the setting
parameter StartByCBOpen=Enabled. Typically a circuit breaker auxiliary contact of type NO (normally
open) is connected to CBCLOSED and RI . When the signal changes from circuit breaker closed to
circuit breaker open an auto reclosing start pulse is generated and latched in the function, subject to the
usual checks. The auto reclosing sequence continues then as usual. Signals from manual tripping and
other functions, which shall prevent auto reclosing, need to be connected to the INHIBIT input.
12.2.2.4 Blocking of the auto recloser
Auto reclose attempts are expected to take place only for faults on the own line. The auto recloser must
be blocked by activating the INHIBIT input for the following conditions:
• Tripping from delayed distance protection zones
• Tripping from back-up protection functions
• Tripping from breaker failure function
• Intertrip received from remote end circuit breaker failure function
• Busbar protection tripping
Depending of the starting principle (general trip or only instantaneous trip) adopted above the delayed
and back-up zones might not be required. Breaker failure trip local and remote must however always be
connected.
12.2.2.5 Control of the auto reclosing dead time for shot 1
Up to four different time settings can be used for the first shot, and one extension time. There are
separate settings for single-, two- and three-phase auto reclosing dead time, t1 1Ph, t1 2Ph, t1 3Ph. If no
particular input signal is applied, and an auto reclosing program with single-phase auto reclosing is
selected, the auto reclosing dead time t1 1Ph will be used. If one of the TR2P or TR3P inputs is activated
in connection with the start, the auto reclosing dead time for two-phase or three-phase auto reclosing is
used. There is also a separate time setting facility for three-phase high-speed auto reclosing without
synchrocheck, t1 3PhHS, available for use when required. It is activated by the RI_HS input.
A time extension delay, tExtended t1, can be added to the dead time delay for the first shot. It is intended
to come into use if the communication channel for permissive line protection is lost. In a case like this
there can be a significant time difference in fault clearance at the two line ends, where a longer auto
reclosing dead time can be useful. This time extension is controlled by the setting Extended t1 = On and
the PLCLOST input. If this functionality is used the auto recloser start must also be allowed from distance
protection zone 2 time delayed trip. Time extension delay is not possible to add to the three-phase high-
speed auto reclosing dead time, t1 3PhHS.
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1MRK 505 370-UUS Rev. K
M12391-100 v6
M12391-103 v4
M12391-113 v5
Busbar protection REB670
Application manual